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  1. Just to confirm back, using a 3v3 USB serial...

    Just to confirm back, using a 3v3 USB serial adapter and Serial1 on the Teensy 4.0, everything works perfectly, so this problem is definitely within the USB serial implementation.
  2. After more playing, I've managed to confirm a few...

    After more playing, I've managed to confirm a few more things around this, but not exactly where the main problem is coming from. As best as I can tell, the serial RX interrupt is being disabled...
  3. A little more playing and I can see that there's...

    A little more playing and I can see that there's definitely an issue here with subsequent serial data being sent. It's not just that Serial.available() isn't being updated, it's that the subsequent...
  4. Assuming this should've been...

    Assuming this should've been serial.setTimeout(0), it made no difference.
  5. Teensy 4.0 Serial.available() stops incrementing

    OK, I really hope I'm doing something dumb, but I'm having all sorts of trouble with some of the serial functions under Teensy 4.

    The issue I'm seeing is that the Serial.available() stops...
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